Rock-drill-sharpening machine.



PATENTED AUG. 1 s, 1908.

G. H. SHAW.

ROCK DRILL SHARPENING MACHINE.

IGATION FILED JULY 2 APPL 1905 a SHEETS-SHEET 1.

0.11. SHAW. 7 BOOK DRILL SHARPENING MACHINE.

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EEEEEEEEEEEE 2 PATENTED AUG. 18,1908.

. drical shell from unscrewing.

CHARLES H. SHAW, or DENVER, COLORADO.

ROCK-DRILL-SHARPENING MACHINE.

Specification of Letters Patent.

Patented Aug. 18, 1908.

Application filed July 29, 1905. Serial No. 271,827.

To all whom it may concern:

Be it known that I, CHARLES H. SHAW, a citizen of the United States of America, residing in the city and county of Denver and State of Colorado, have invented a new and useful Rock-Drill-Sharpening Machine, of.

which the followin is a specification.

My invention relates to improvements in rock drill sharpening machines, and the 0bj ects of my invention are: First, to provide a drill sharpener in which a pneumatic hammer is used for sharpening rock-cutting drillbits. And second, to provide a very rapid rock drill sharpener, that is simple and durable in construction. I attain these objects by the mechanism illustrated in the accompanying drawings, in which:

Figure 1, is a side elevation of my improved rock drill sharpener. Fig. 2, is a plan view of the same. Fig. 3, is a longitudinal section in side elevation of Fig. 2, on line 33. Fig. 4, is a sectional end elevation of the drill inserting end of my rock drill sharpener, showing a section through the drill holding vise on line 4-4 of Fig. 3. Fig. 5, is a ers ective view of one of the jaws of the dr' lho ding vise. Fig. 6, is an elevation of one of the journal caps of the jaws of the vise. Fig. 7, is a side elevation of the pivotal nut of the jaws of the drill holding vise. Fig. 8, is an end elevation of the die bars bushing. Fig. 9, is a section of Fig. 8. Fig. 10, is a plan view of the motive fluid inlet reducing nilpple. Fig. 11, is an end view of Fig. 10. ig. 12, is' an end elevation of the pneumatic hammer piston supporting casing end of the bed of the shar ening machine. Fig. 13, is an end view 0 the rock cutting lips forming die of the die bar. Fig. 14, is an end view of the plug of the hammer pistons cylindrical shell. Fig. 15, is a section on line 1515 of Fig. 3. Fig. 16, is an enlarged view of the locking pin I employ to prevent the rear plug of the hammer pistons cylin- Fig. 17, is a sectional view of the supporting bed of my improved drill sharpener. And Fig. 18, is a plan view of the top of the supporting legs of the bed of the drill sharpener.

Similar letters of reference refer to similar parts throughout the several views.

Referring to the drawings: The numeral 1, designates the supporting bed of my drill sharpener, and 2, designates the supporting legs of the bed, which for convenience in manipulating is raised above the floor high enough to be within easy handling of an operator when standing erect. The legs are bolted to the opposite ends of the bed, andbracing and stifiening bolts 3, are also placed through the bottoms of the legs and extend across between them. The feet of the legs are provided with lugs 4, provided with apertures, in which screws or bolts may be placed to firmly secure them to a floor.

ed consists of a block-shaped casting, the lower portion of which is made hollow. One endof the block contains an upward projecting lug 6, and on the opposite end of the block a lug 7, is formed. An axial aperture 8, is formed through the lug 6, and an open slot 9, is formed in the top of the lug 7, that is arranged to form a space in the lug 7, in alinement with the axial hole in the lug 6. To the top of the lug 6, one end of a yoke 10, is removably secured by a cap screw 11 the opposite end of this yoke'extends over to the top of the lug 7, and at its end is provided with two laterally extending lugs 12, which are bolted to the top of the lug 7, on each side of the slot 9. The central portion of this yoke is provided with asemi-circular recess 13, which fits over the central portion This I trally and rotatably by the yoke against lateral movement in either direction between the lugs 6 and 7, and at a short distance from the lug 6, a third upwardly projecting lug 17, is formed, which is separated from both of the lugs 6 and 7, but is placed closer to the lug 6 than to the lug 7, and between the lug 7, and the lu 17 I pivotally mount a drill or drill bar ho ding vise, which consists of two chuck jaws, 18 and 19, the lower ends of which are pivotally mounted on a pin 20, which extends through both lugs, and is secured in any suitable manner to them. The lower ends of these jaws are provided with lugs, one jaw being provided with two lugs 21, which straddle the lug 22, of the other aw. Just above these lugs, in the opposing faces of the jaws, dies 23 and 24, are inserted, in suitable recesses formed in the jaws to receive them, and are secured to them by bolts 25, or by any other suitable means.

The top I cylindrical block of metal 32, which is proends of these jaws preferably slope backward from the dies, and their top ends are provided with a central recess 26, Which divides or bifurcates each top end into two separate ends 27 and 28, in each of which adjustable journals are formed, which consist of a semi-circular recess formed in the top edge of the rear side, and a cap 30,

which contains a semi-circular bearing re-' cess. The cap is secured to the jaw by a cap screw 31. In the bearings ofeach jaw, I journal loosely the opposite ends of a short vided between its bearing ends wi a threaded aperture 33, to which the chuck screw is threaded, said chuck screw being made long enough so that its opposite ends will extend through and beyond the pivotal cylindrical block far. enough to permit operative movement of the jaws. UT on one end of said chuck screw, I place a and wheel 33., by which the chuck screw is manually rotated to open and close the dies to grip a jaws are simultaneously opened by moving away from each other or closed by moving towards each other, and closed to grip a drill.

To the face of the lug 6, I'secure one end 'of a pneumatic hammer cylinder casing 35, preferably in the following manner: I provide the face of the lug with a counterbore 36, concentric to the aperture 8, extending through it, and in this counterbore I insert a ring 36, which is formed on the end of the hammer cylinder casing concentric to its bore 37. This ring is machine-finished on its end and surface to fit accurately against the bottom and the side of the counterbore. A flanged portion .38, is formed on the cylinder adjacent to this end lug, which referably does not'touch the adjacent face 0 the lug 6. Through this flange,.two cap screws 39, extend, which are threaded into the lug close to thetop of the cylinder, while a bolt 40, extends through the flange underneath the cylinder, and its opposite head end is secured in asocket 41, which is provided with lugs 42, arranged in the socket, a recess being formed between the lugs in which the body of the bolt fits loosely, and a space is left in the socket back of the lugs in which the head of the bolt projects. screws clamp the hammer cylinder casing to the bed portion of the drill sharpener, in axial alinement with the cylinders bore. This rock cutting drillbit forming cylinder comprises the outer casing 35, which is This bolt and the cap provided with an axial bore 37, in which is I slidably fitted a hammer piston containing cylindrical shell 45, which extends from its front end 46, ,to near its rear end 47. In this rear end a rear cylinder head 48 is secured, preferably by threading it into the end of the cylinder. The cylinder head is provided with a wrench receiving hub 49, by which it may be turned. The rear end of the hammer piston cylindrical shell is provided with a rear end plug 50, that is threaded to it, and from the rear end of which a hub portion 51, extends towards the rear. cylinder head. This hub is provided with an axial aperture or bore 52, in which a pin 53, fits snugly but slidably. The hammer piston cylinder has a forward movement, due to the actuating fluid, and also a slight recoil movement in the outer cylindrical shell, due to the blow of the hammer, and the hub portion 51., of the plug of the hammer piston cylinder extends rearward of it to within a short distance of the rear cylinder head, when the hammer piston cylinder is at the forward end of its reciprocating or recoil stroke,this short space being a predetermined one of suflicient length to allow the hammer piston cylinder to recoil after the hammer piston has struck a blow on the end of the dolly or drill-bit forming die bar 54, and also sufficient to allow the piston hammer cylinder to move back:

ward against the rear cylinder head, after the forming of a drill-bit end has been completed on the end of a drill and the air has been cut off The casing fitting rear end of the hammer piston cylinder ends at a short s ace from the rear cylinder head, to form a c ear space for any rearwardly leaking hammer actuating fluid, and an escape or exhaust aperture 55, is formed through the shell of the casing to the atmosphere, to allow it -to freely escape. The plug 50, in the rear end of the hammer piston cylinder is provided with a flange 56, that bears against the end of this cylinder, and at one side of the cylinder a small hole 57, is drilled the inside of this flange, and a coiled spring 58, is placed in the bottom of the hole in the cylinder, and a pin 59, is inserted in the hole and is adapted to compress the spring until the plug is screwed 11 against the end of the cylinder, and then re eased, when the expansive tension of the spring will force the pin into the hole in the plug and lock it against unscrewing.

' I preferably arrange the pin to compress the spring and hold the pin wholly within the hole in the cylinder, in the following manner: The hole in the flange 56, opens out to the periphery of the flange, and the front end of the hole 57, in the hammer piston cylinder also opens out to the periphery of the cylinder, and by the use of any suitable article or implement the pin may be pushed back artially into the end of the shell of the cy inder, and partially into a ainst the spring and held there while the pTug is screwed up, and by inserting the implement in the hole in the flange 56, the pin may be pressed back, to allow the plug to be unscrewed from the end of the cylinder. The threaded inner end of this plug is provided with an axial aperture 62, and a circumferential port 63, is formed in the inner periphery around the threaded end portion of this plug by cutting out a few threads around its surface, and in the cylinder, and from this port a port 64-, is drilled through the plug into the axial aperture 52. The shell of the cylinder is provided with a port 65, which is drilled into the rear end of the cylinder, and the entrance of the hole is plugged up by a threaded plug 66. A small port aperture 66*, extends through the shell of the cylinder from this port 65, into the port 63. The axial bore of the hammer pistons cylindrical shell, is preferably made in two diameters, and a hammer piston 67, of two diameters, is reciprocally mounted in it, a shoulder 67, being formed at the junction of the two di ameters of the hammer, and to the rear side of the smaller diameter of this cylindrical shells bore, a circumferential port 68, is formed in the inner periphery of the cylinder, which is intersected by an inlet aperture 69, which extends through the bottom of the cylinder and intersects an oblong slot 70, formed in the outer cylindrical casing, which is large enough to receive and allow of a reciprocal movement of a reducer nipple 71, equal to the reciprocal movement of the cylinder. The enlarged end of this nipple is adapted to be connected to one end of a hose 72, in which a valve 72, is placed. The other end of this hose leads to a supply of compressed air, or other suitable hammer piston actuating fluid. The circumferential port 68, is connected to the port 65, by a port 73. The hammer piston is provided with an axial bore 74, of preferably three diameters, which extends into it from its rear end to near its front end, the largest part of the bore bein at the rear end of the hammer, and the smallest at its forward end. A circumferential row of ports 75, extends through the shell of the hammer at its largest end into its largest interior bore, and a circumferential row of ports 76, extends through the front end of the shell of the hammer into its smallest interior bore, which connects with the above mentioned ports of this cylinder to reciprocate the hammer piston, as will be fully explained hereinafter. The forward end of the piston hammer projects through its supporting bore into a chamber 77, formed in the cylinder, in which exhaust ports 76, are formed through its shell, which register with an oblong slot 76, formed through the shell of the casing, which connects the exhaust ports 76 to the atmosphere. The front wall of this chamber 77 is provided with a hexagon or other polygonal shaped axial aperture 78, through which projects loosely the rear end of the rock cutting lips forming dolly or die bar 54, which comprises a round bar containing a die or matrix of rock cutting lips in the face of its front end. I preferably use six cutting lips in the end of the die bar, but more may be used if desired.

Some drills and some drill bars are solid, while others are made hollow or contain an axial aperture for the passage of air and water to the rock cutting lips, and when making or resharpening hollow drills a short projecting stem 54 is formed in the axial center of the die, which projects into the axial aperture in the drill or drill bar, as illustrated in Fig. 3. But when solid drills are to be made or resharpened, a die bar is used that is not provided with this stem, as it is not needed. The stem by projecting into the aperture of the hollow drill prevents the axial aperture from being closed up, while the die is forming the rock cutting lips in its end under the blows of the hammer piston. The term drill bar is used to apply to a hollow or solid bar of steel, from which a drill is to be made, and the term drill applies to a drill that is to be resharpened. This die bar further consists of a reduced polygonal shaped rear hammer striking end portion, having a collar at the junction of its body and reduced hammer striking end portion, the hexagon or otherpolygonal shaped end projecting reciprocally through the similar shaped aperture in the wall of the chamber, into the reciprocal path of the piston hammer, and prevents the die bar from turning. The forward end of this cylinder is also provided with an axial bore in which a removable metal abutment, bushing, or thimble 79, is placed, which surrounds the reduced end of the die bar and is provided with an axial shaped aperture adapted to receive and fit loosely the shape of the die bar. The front end of the hammers cylindrical shell does not extend to the front end of the outer casing, a short space being left in which a coiled expansive spring 80, is placed. This spring extends around the body of the dolly or die bar 54, and bears at one end against the collar 81, of the dolly or die bar, and at its opposite end against the bottom of the counterbore 36, of the lug 6, of the bed of the drill sharpening machine. This spring is employed to hold the hammer cylinder and the die bar back to the rear end of their reciprocal or recoil movement in the outer casing, away from the end of the drill, when the air is shut off and the hammer is inoperative. The die bar projects reciprocally through the aperture 8, in the lug 6, in front of and in axial alinement with the vise bushings in the center of the drill bar gripping jaws. An oil hole, 82, is drilled into the top of the lug 6, to the die bar, to lubricate its bearing to this lug.

The operation is as follows: The motive actuating fluid, which is compressed air, is admitted to the inlet port 69, through the hose 72, and valve 72*, and the reducer 71,

from a suitable supply of compressed air, and flows into the port 68, from which it flows against the shoulder 67, between the two diameters of the hammer, and pushes the hammer to the rearward end of its stroke, and as the hammer moves rearward the air flows into the circumferential row of ports 76, in the front end of the hammer, and flowing to the rear end of the hammer, cushions its rear stroke, and at the same time drives it forward with great force, as the area of the rear end of the hammer is very much greater than the area of the shoulder 67 and the hammer is reciprocated with great rapidity in its recoiling cylinder. The hammer during its reciprocal strokes, strikes the end of the die bar 54, and it strikes with great rapidity against the end of the drill or drill bar on i which rock cutting lips are to be formed,

such drills or drill bars areheated red hot, and are clamped tightly between the bushings of the jaws 18 and 19 of the drill holding vise, and the compressed air motive fluid is turned on to the cylinder by the valve 7 2 in the air supply hose, which reciprocates the hammer piston very rapidly in its cylindrical shell and causes it to strike very rapidly against the die bar, and the die end of the die bar strikes very rapidly against the hot end of the drill or drill bar and forms a sharp set of rock cutting lips on it in a very few seconds of time, when the jaws of the vise are opened, and drill removed, and another new drill bar or old drill is inserted, and new rock cutting lips formed on it. The instant the motive fluid is turned on, it flows from the inlet port 69, through the ports 68', 65, 66 63, and 64, into the bore 52, of the plug of the cylindrical shell, and flowing against the inner end of the pin 53, which bears against the rear cylinder head of the cylindrical casing, pushes the cylindrical shell and the die bar 54 forward until the die bears against the'end of the drill and holds it there as long as the motive fluid is turned on. The starting of the hammer and the forward movement of the die bar against the drill, are simultaneous, and as soon as the hammer and die bar have formed. perfect cutting. lips on the drill, the operator turns the motive fluid off by closing the valve 72*, when the spring 80, by its expansive tension moves the die bar and the cylindrical shell to the rear end of their reciprocal movement in the casing. The object of this rearward movement is to move the die bar out of the way of the drill, while it is being removed, and another one is placed in the vise.

About one hundred, drills can be resharpened each hour, or as many new drills made in my improved drill sharpening and making machine. While I have illustrated the preferred construction .of my improved drill sharpener, I do not want to be limited to the construction and arrangement shown, as various other arrangements of mechanical 7 elements might be used to accomplish the same purpose without departing from the spirit of my invention.

Having described my invention, what I claim as new and desire to secure by Letters Patent is:

1. In a drill sharpener, a supporting bed, a vise for holding the drill, a cylinder secured to the bed, a cylindrical shell reciprocably mounted in said cylinder, a hammer reciprocably mounted in said shell, a die-bar supported by the shell in axial alinement with said vise and drill, and arranged to project into the path of the hammer, an additional di support fixed on the bed, means for actuating the hammer and means for moving and holding the die-bar against the end of the drill during the stroke of the hammer against it.

2. In a drill sharpener, a supporting bed, a vise for holding the drill, a cylinder secured to the bed, a cylindrical shell reciprocably mounted in said cylinder, a hammer reciprocably mounted in said shell, a die-bar supported by the shell in axial alinement with said vise and drill, and arranged to project into the path of the hammer, an additional die support fixed on the bed, means for actuating the hammer and pneumatic means for moving and holding the die-bar against the end of the drill during the stroke of the hammer against it.

3. In a drill sharpener, the combination with a bed having a die-bar support, a cylindrical casing secured to said support, a cylin- 5 drical shell within the casing having die-bar supporting and engaging means, a die-bar reciprocably mounted in the sup ort and shell, means for advancing the shel within the casing, a hammer piston mounted in the 110 shell and means for operating the hammer.

4. In a drill sharpener, the combination with a bed having a die-bar support, a cylindrical casing secured to said support, a cylindrical shell within the casing having die-bar 115 supporting and engaging means, a die-bar reciprocably mounted within the support and shell, means for advancing and retracting the shell and die-bar, a hammer piston mounted in the shell and means for operating the ham- 20 by said yoke, as set forth.

6. In a drill sharpener, the combination of the bed, drill-gripping j aws pivoted to the bed,

opposite ends of.said shaft, a pivotal box in each of said jaws threaded to the threaded ends of said shaft, and a hand wheel on one end of said threaded shaft, as set forth.

7. In a drill sharpener, the combination of the bed, the opposing jaws pivoted to said bed, the opposing drill-holding bushings secured in said jaws, the pivotal nuts journaled to said jaws, the right-and-left-handed screw operatively threaded to said pivotal nuts to open and close said jaws to grip and hold a drill, and means operatively supporting and turning said screw, as set forth.

8. In a drill sharpener, the combination of the bed, a die-bar having a die formed on one end adapted to form rock-cutting lips on the end of a heated drill, a cylindrical casing secured to said bed, a hammer-piston cylinder reciprocably mounted in said casing and arranged to loosely and reciprocably support the opposite end of said die-bar, a hammerpiston reciprocably mounted in said hammer piston cylinder and arranged to strike the adjacent end of said die-bar, means including a system of ports and conduits arranged to operate said piston and to hold said pistonhammer cylinder and die bar normally against the adjacent end of said heated drill,

a collar on said die-bar, and a spring on said die-bar between said collar and said bed, arranged to normally push said piston-ham- Iner cylinder and die-bar backward in said cylindrical casing away from said drill after a rock-cutting point has been formed on it by said die and hammer and said hammer-piston actuating-fluid has been cut ofl, as set forth.

9. In a drill sharpener, the combination of the supporting bed, and the die bar supported by said bed, with a cylindrical casing provided with a rear cylinder head secured to said bed and surrounding said die bar, a cylindrical shell reciprocally mounted in said cylindrical casing, and adapted to support the inner end of said die bar, a hammer piston reciprocally mounted in said shell in striking relation to said die bar, a plug in the rear end of said cylindrical shell, a pin fixed to the casing slidably mounted in said plug and extending against said rear cylinder head, and a series of fluid pressure ports arranged to operatively reciprocate said hammer piston and to admit the fluid pressure between said pin and said plug, whereby said cylindrical casing and die bar are moved forward by fluid pressure against the end of the drill and held there during the operative rock cutting lip forming operation of the hammer, as set forth.

10. In a drill sharpener, the combination with the bed, and the cylindrical casing, of the die bar reciprocally mounted in said bed and cylindrical casing, a counterbore in said bed in which the end of said casing is fitted, means, including bolts, for securing said casing to the counterbore in said bed, said casing having a cylindrical space adjacent to the bottom of said counterbore, a collar on said die bar in said space, and an expansive coiled spring around said die bar between the bottom of said counterbore and said collar, whereby said die bar and cylindrical shell are normally held at the rear end of their reciprocal movement during their periods of dis-use, as set forth.

In testimony whereof I aflix my signature in presence,of two witnesses.

CHARLES H. SHAW. Witnesses:

G. S. ELLIOTT, HARRY H. TANGEMAN. 

